JP3435229B2 - Machining method by NC lathe and NC lathe capable of backup machining - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining method using an NC lathe having at least one of a spindle and a tool rest, and machining them in association with each other, and an NC lathe capable of back-up machining.

[0002]

2. Description of the Related Art An NC (numerical control) lathe is designed to rotate a spindle according to a machining program and to move the spindle in a direction of a center line (Z).
Direction) and the movement of the tool post in the X and Y directions (two directions orthogonal to each other in the plane orthogonal to the Z direction),
A machine tool that processes a material (workpiece) held on a spindle by a tool (cutlery) attached to a tool post,
Recently, CNC lathes equipped with computers are becoming mainstream.

Further, the processing speed of such NC lathes has been increased, the efficiency of the processing process has been improved, the processing accuracy has been improved, and the functions have been expanded (general versatility), flexibility and safety have been improved. Measured and used in a wide range of component processing. For this reason, recent NC lathes are equipped with a plurality of spindles and / or tool turrets, or both, and many of them can perform machining efficiently by associating them with each other.

[0004]

However, in such a conventional NC lathe, when an abnormality occurs even in one of the plurality of spindles or the tool rest, an alarm state occurs, and until the abnormal state is canceled, no machining work is performed. Therefore, if it takes a long time to restore the work, the work schedule is significantly delayed, which causes a serious problem. In addition, it was not possible to process without using part of the spindle or the tool post in order to save setup work when processing a small amount of parts, or when the amount of material was reduced. .

The present invention has been made in view of the above points, and it is possible to continue processing as much as possible even when an abnormality occurs so as to shorten the time when the movable ratio becomes zero, and the operator. The purpose of the above is to enable machining without using part of the spindle or the tool post.

[0006]

In order to achieve the above-mentioned object, the present invention has a plurality of spindles and / or tool rests, and NCs which perform machining in association with each other.
By turning, when the part of the person having a plurality of the spindle and the tool rest to be used in the normal processing abnormality due determined to be unused by the setting or become unavailable is generated, its
Shut off the power supply to the part where the
Abnormal disconnection processing to ignore the detection signal from
After performing the above , there is provided a machining method using an NC lathe that performs back-up machining by a pre-stored machining program that enables back-up machining using the remaining usable spindle and tool rest. In this processing method,
It is possible to use the previously stored machining programs as a plurality of different types of backup machining programs, determine the type of backup machining by the combination of the usable spindle and tool post, and select the backup machining program according to the type. it can.

The present invention also provides an NC lathe having at least one of a spindle and a tool post, which performs machining in association with each other, and which is provided with the following means for backup machining. .

(A) Machining operation control means for controlling machining operation by the spindle and tool post, (b) Abnormality presence / absence judging means for judging presence / absence of abnormality, (c) Abnormality presence / absence judging means determines that there is no abnormality. when normal processing control means for operating to perform the processing by using the main shaft and tool rest for use in a normal processing in the processing operation control means, when it is determined that there is abnormality (d) the abnormal state determining means, Abnormality content determination means for determining the content of the abnormality, (e) The determination result indicates that some of the plurality of spindles and turrets used in the above-mentioned normal machining become unusable or not used depending on the setting. When the abnormality is caused by the operation, the power supply to the part where the abnormality has occurred is cut off.
Error detection so that the detection signal from it is ignored.
After performing the separation processing, the backup processing control means for operating the processing operation control means so as to perform processing by using the remaining usable spindle and tool post, and the backup processing in the NC lathe capable of backup processing. The control means may have a plurality of backup machining programs selected by the remaining usable combinations of the spindle and the tool rest.

[0009]

When the NC lathe machining method of the present invention is carried out, a plurality of spindles or a part of the tool post become unusable, or even if they are not used due to the setting, the remaining usable spindles and tool post You can continue to process parts by using the backup process. Therefore, the situation in which the mobility becomes zero can be significantly reduced as compared with the conventional case. Also, it can reduce the time and effort required for setup when producing in small quantities.
Processing can be continued even if there is only one round bar of material for the NC lathe of the spindle.

Further, in the NC lathe capable of back-up machining according to the present invention, when an abnormality occurs (including the case where the spindle or a part of the tool rest is set to be unused), the remaining usable spindle and tool rest are used. If they can be processed by, the back-abb processing using them is automatically performed. Therefore, the above processing method according to the present invention can be automatically carried out.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 3 is an external perspective view showing an example of an NC lathe for carrying out the processing method according to the present invention.

This is an NC lathe of a headstock sliding type for machining a bar material, and has two main spindles and one back spindle. That is, as shown in FIG. 3, the first headstock 11A and the second headstock (not shown) are provided in the rear portion of the upper surface of the bed 10 in the Z-axis direction (arrows Z1, Z2 directions) parallel to the center line of the spindle. The first headstock 11A and the second headstock are slidably mounted along a guide rail (not shown), and a feed screw (not shown) is provided by a Z1 axis servomotor and a Z2 axis servomotor, respectively. They are moved independently of each other through the mechanism in the directions of arrows Z1 and Z2.

A first spindle that is rotatably supported by the first spindle stock 11A and the second spindle stock, and is independently rotated by a first spindle motor 12A and a second spindle motor (not shown). A center line (only the center line is indicated by A) and a second main axis (only the center line is indicated by B) are provided in parallel with each other with a predetermined distance therebetween.

A tool rest base 13 is fixed to the bed 10 in front of the first spindle and the second spindle, and stands upright over the entire width of the bed 10. The turret base 13 has a first position at a position concentric with each center line of the first spindle and the second spindle described above.
The guide bush 14A and the second guide bush 14B are arranged, and the works 15A and 15B gripped by the first main spindle and the second main spindle, respectively, slide in the Z-axis direction by the first and second guide bushes 14A and 14B. Be movably guided.

The tool rest base 13 is further provided on both sides (upper side in FIG. 3) of a line (hereinafter referred to as "reference straight line") L intersecting with each of the center lines A and B of the first spindle and the second spindle. And a lower side), a first turret 17A and a second turret 17B are provided, respectively. This first and second turret 17
A and 17B are guide rails 16 formed on the front surface of the tool post base 13 over the entire width thereof in parallel with the reference straight line L.
A Y-axis table 18 that is fitted to A and 16B and slides in the Y-axis direction parallel to the reference straight line L (directions Y1 and Y2 shown by arrows).
It is mounted on X-axis tables 19A and 19B which are provided on A and 18B and which slide in the X-axis direction (the X1 and X2 directions shown by the arrows) orthogonal to both the Y-axis and the Z-axis described above.

The Y-axis table 18A is mounted on the tool rest base 13 in the Y1 direction indicated by the Y1-axis servo motor 20A, and the Y-axis table 18B is mounted on the tool rest base 13 for the Y2-axis servo motor 20B.
Is driven along the guide rails 16A and 16B by the feed screw mechanism in the Y2 direction indicated by the arrow, and can reciprocate over substantially the entire length thereof.

The X-axis table 19A is the Y-axis table 18A.
X1 axis servo motor 21A attached to the Y axis table 18A in the X1 direction, and X axis table 19B is attached to the Y axis table 18B by the X2 axis servo motor 21B attached to the Y axis table 18B. In each direction, each is driven by a feed screw mechanism, and can reciprocate by a predetermined stroke.

Each of the first and second turrets 17A and 17B has a plurality of (four in the illustrated example) tools 22A,
, 22B, ... Are attached in a comb-teeth shape at predetermined intervals in the Y-axis direction. In the illustrated example, the tools 22A,
, 22B, ... are all cases where they are outer diameter cutting tools such as cutting tools.

Further, a rear tool post 23 is fixedly provided at an extension position of the reference line L at the right end portion of the tool post base 13 in FIG. 3, and a plurality of back tool posts 23 (three in the illustrated example) are provided on the rear tool post 23.
Are arranged so that their centers are lined up at predetermined intervals on the extension line of the reference line L. This tool 24, ...
Is a tool for back surface processing, for example, a relative rotating tool such as a drill or an end mill, and can be processed even if the tools 24, ... Are not necessarily rotated, if a work chucked by a back surface spindle described later rotates.

A groove 10a is formed on the front side of the tool rest base 13 of the bed 10 so as to extend over the entire width in the Y-axis direction. Forming a guide rail 25 extending in the direction,
A rear headstock base 26 is slidably fitted to the guide rail 25, and a rear headstock 27 can be slid on the guide rail 25 in the Z3 direction indicated by the arrow parallel to the centerline of the rear main spindle provided therein. It is provided in. The direction of the arrow Z3 is parallel to the directions of the arrows Z1 and Z2, which are the moving directions of the first and second headstocks described above.

The rear headstock base 26 is moved in the Y3 direction (direction orthogonal to the Z3 direction in the horizontal plane) by a Y3 axis servomotor 28 attached to the bed 10 via a feed screw mechanism (not shown). Driven and bed 10
It is reciprocally movable over substantially the entire width of. Rear headstock 27
Is driven by a Z3 axis servomotor 29 attached to the rear headstock base 26 via a feed screw mechanism (not shown), and is capable of reciprocating a predetermined stroke in the Z3 direction with respect to the rear headstock base 26.

The back spindle provided inside the back spindle 27 has its center line at the height of the reference line L, and has a chuck for gripping a work piece at its tip, and a spindle motor 30 for the back spindle. Is rotated by. The work held on the back spindle is mainly the back tool post 2 described above.
It is processed by the tools 24, ... Attached to No. 3, but when a tool for back surface processing is attached to the first turret 17A or the second turret 17B, it is also possible to process them.

Further, an opposed tool post 31 is fixedly provided on the left side surface of the rear headstock 27 in FIG. 3, and a plurality of (three in the illustrated example) tools 32, ... It is attached so as to be lined up at a predetermined interval in the arrow Y3 direction at the same height as. These tools 32, ... Are also relative rotary tools such as drills and end mills, and can perform drilling, thread cutting, etc. on the front end face of the rotating work held by the first or second spindle. Is.

As described above, this NC lathe has two main spindles for face machining and the first turret 1 which can be shared by the respective main spindles.
7A, the second turret 17B, and the opposed turret 31, and a set of back spindle and back turret 23 for back machining are provided, and these are associated with each other to form a pair of guide bushes 14A and 14B. Two workpieces 1 each guided
5A and 15B can be processed simultaneously.

Next, the configuration of the control unit of the NC lathe shown in FIG. 3 will be described with reference to the block diagram of FIG. This control unit includes a system control unit 40 including a CPU, a program input unit 41, a keyboard 42a and a switch 42.
b, an operation panel 44 having a display 43, an input / output control unit 45 thereof, a system control program memory (RO
M) 46, automatic programming unit 47, machining program memory 48, display data storage unit 49, RAM 50 for storing other data, machining program processing unit 51, communication control unit 52, machining operation control unit 53, and machining thereof. The drive unit 60 that directly controls the drive of the mechanical unit shown in FIG. 3 is controlled via the operation control unit 53.

The drive unit 60 is a servo motor (20A, 20B, 21A, 21B, 28, 29) for each axis shown in FIG.
Etc.), a control drive unit 62 for each axis for driving and controlling a servo mechanism 61 for each axis motor, a spindle motor (12) for each spindle.
A, 30 etc.) 63 and a spindle motor control drive section 64 for driving and controlling, and a sensor input section 66 etc. for inputting detection signals of each sensor (rotation speed sensor of each spindle motor, position sensor of each table, etc.) 65. .

The system control unit 40 is a unit for integrally controlling the entire control unit, and thus the entire NC lathe, and together with the automatic programming unit 47, a machining program creation process and the keyboard 42a of the operation panel 44 or the input / output control unit 45. Input of data and commands from the switch 42b, processing related to processing programs and other displays on the display 43, and the driving section 60 is operated based on the processing program stored in the processing program memory 48 together with the processing operation control section 53 to operate the NC. Performs processing for processing. Further, the processing relating to the backup processing when an abnormality occurs (including the setting of partially unused by the operator) according to the present invention is also performed.

The program input section 41 is a paper tape reader, a floppy disk device (FDD) or the like for inputting a processing program created by an external program creating device (such as a personal computer) from a paper tape or a floppy disk. The operation panel 44 issues an operation command from the keyboard 42a or the switch 42b when performing NC processing,
The display 43 serves as a driving operation means for confirming the operation. In addition, the automatic programming unit 47
When a machining program necessary for the NC lathe itself is created using the function of, it becomes an interactive input means for performing interactive automatic programming.

The input / output control unit 45 determines the commands and inputs from the keyboard 42a or the switch 42b of the operation panel 44, controls for displaying the display data stored in the display data storage unit 49 on the display 43, and the like. To do. The system control program memory 46 is a ROM that stores programs and fixed data used by the CPU of the system control unit 40 to control the operation of the control unit.

The automatic programming section 47 includes a control panel 44.
In addition, it is a functional unit that creates a machining program, which is actually a function of the system control unit 40, but is shown as a separate block for the sake of clarity.

The machining program memory 48 includes a machining program storage section 48a and a backup program storage section 48.
RAM with b. Processing program storage section 48a
In addition, a machining program for performing normal NC machining, an abnormality presence / absence determination program related to backup processing, an abnormality content determination program, a backup machining type selection program, etc., which will be described later, are also stored. The backup program storage unit 48b stores a plurality of backup machining programs that differ depending on the usable combination of the spindle and the tool rest.

The display data storage section 49 is a memory (RAM) for storing various data to be displayed on the display 43 of the operation panel 44. The RAM 50 is a memory that stores data of each tool (tool) used for machining, various initial set data, and the like. The processing program memory 48 and the display data storage unit 49 can also be used as long as the storage capacity of the RAM 50 is sufficient.

When the machining program stored in the machining program storage unit is used for machining control, the machining program processing unit 51 discriminates the system of the machining program and changes to the execution form to control the machining operation. It has a function of sending to the unit 53. An abnormal part separation processing program, which will be described later, can also be stored here. However, this abnormal part separation processing program is stored in the machining program memory 48.
It may be stored in.

The communication control unit 52 is a circuit for controlling communication with an external system such as a DNC device, and transfers the created machining program to the external system and stores it in its storage medium, or the machining program from the external system. Used when importing.

An embodiment of the machining method of the present invention using this NC lathe will be described with reference to FIG. At the time of normal machining, as shown in FIG. 1A, the same parts are machined by shifting by a half cycle between the first spindle side and the second spindle side. First, the tip of the bar (workpiece) set on the first spindle side is cut off, then the first half of the work is done with the tool of the first spindle and the tool post, and then the first spindle. Second
Perform the latter half of the process with the tool on the turret. This completes the machining of one work, but when repeating machining, the steps from the first cut-off machining are repeated again.

On the other hand, on the second spindle side, after the tip end of the bar set at the time of finishing the first half of the first spindle side is cut off, the second spindle and the tool of the first turret are cut off. The first half of machining is performed, and when the second half of machining is completed on the first spindle side, the first turret is replaced with the second turret and the second half of machining is performed to complete the machining of one workpiece. When the repetitive machining is performed, the steps from the first cut-off machining are repeated again as in the case of the first spindle side.

If an abnormality occurs in the second spindle and it cannot be used, or if it is set not to use the second spindle, the first backup machining shown in FIG. Machine only on the spindle side. That is, after the cut-off processing, the first half of the machining is performed with the first spindle and the tool of the first turret, and then the turret is replaced with the second turret to perform the latter half of the machining. In the case of repeatedly processing after that, this processing step is repeatedly executed.

If an abnormality occurs in the first spindle and it cannot be used, or if it is set not to use the first spindle, the second backup machining shown in FIG. Machine only on the spindle side. That is, after the cut-off processing, the first half of the machining is performed with the second spindle and the tool of the first turret, and then the turret is replaced with the second turret to perform the latter half of the machining. In the case of repeatedly processing after that, this processing step is repeatedly executed.

Further, if an abnormality occurs in the first turret or the second turret, or even if it is set not to use it, is it possible to mount all the tools necessary for machining with only one turret? Alternatively, if a shortage of tools can be installed in a usable manner by using another tool rest such as the facing tool rest 31 shown in FIG. 3, backup processing is performed by the combination of the usable spindle and tool rest. Is possible.

As described above, the backup process can be uniquely determined by the usable spindle and tool post. Circled numbers in FIG. 1 indicate program numbers of respective steps, and steps having the same number are controlled by the same program. Each program will be described later.

FIG. 2 is a functional block diagram showing only a portion related to backup processing in the control unit shown in FIG. 4 of the NC lathe capable of automatically performing such backup processing.

The abnormality presence / absence determining unit A is means for determining the presence / absence of abnormality, and this abnormality includes the case where a plurality of spindles or a part of the tool rest are set to be unused by the operator. When the abnormality determination unit A determines that there is an abnormality, the abnormality content determination unit B determines whether the abnormality content is an abnormality related to the spindle or the tool post, and if so, which backup processing is possible. It is the abnormality content determination means. These are realized by the function of the system control unit 40 in FIG.

The normal machining program C drives the machining operation control unit 53 to perform machining using the spindle and the tool post used in normal machining when the abnormality presence / absence judging unit A judges that there is no abnormality. It is a machining program as a normal machining control means for operating the unit 60, and is stored in the machining program storage unit 48a shown in FIG.

The first backup machining program D and the second backup machining program E have an abnormality presence / absence judging section A.
Is determined to be abnormal, and the abnormality determination unit B determines that some of the spindles and turrets that are used in normal machining have a part that is unusable or is not used due to the setting. When it is determined that the machining operation control unit 53 is a machining program as a backup machining control unit that operates the drive unit 60 to perform machining using the remaining usable spindle and tool rest, the machining program is shown in FIG. It is stored in the backup program storage unit 48b.

The contents of the first backup machining program D and the second backup machining program E differ depending on the usable combination of the spindle and the tool post. In this example, the first backup machining program D is a program for performing the first backup machining shown in FIG. 1B, and the second backup machining program E is the second backup machining program E shown in FIG. This is a program for backup processing.

The abnormal portion disconnection processing program F disconnects and controls the drive portion 60 via the machining operation control portion 53 so as to cut off the power supply to the portion where the abnormality has occurred and ignore the detection signal from the portion. And is stored in a part of the machining program processing unit 51 or the machining program memory 48 in FIG.

In the abnormality processing program G, the abnormality content discriminating unit B discriminates that the abnormality content is not related to the spindle or the tool rest, or is related to the spindle or the tool rest but has no backup program prepared. Is a program for causing the machining operation control unit 53 to perform an abnormal process such as power-off of the drive unit 60, causing an alarm to occur in the alarm generation unit H, and notifying the operator of the abnormal state. No. 4 stored in the machining program memory 48.

A storage example of each program used in this embodiment is shown in FIG. In this embodiment, the abnormality presence / absence determination program used in the abnormality presence / absence determination unit A, the abnormality content determination program and the backup machining type selection program used in the abnormality content determination unit B, and the normal machining program C are used.
At the same time, it is stored in the machining program storage unit 48a in the machining program memory 48 of FIG.

Then, the first backup machining program D and the second backup machining program E are stored in the backup program storage section 48b, and the abnormal portion separation processing program F is stored in the machining program processing section 51.

FIG. 6 is a flowchart of the processing process according to this embodiment. When the machining is started, it is first judged whether or not there is an abnormality. If there is no abnormality, the normal machining program C executes the normal machining shown in FIG. 1A to machine two workpieces. Then, if the repetition is set, the processing by the normal processing is repeated, and if the repetition is not set, the processing ends.

When it is determined that there is an abnormality, it is determined whether or not there is an abnormality relating to the shaft / turret, and if not, abnormal processing such as power shutoff and alarm generation is performed, and then the processing is terminated and restoration is performed. wait. If it is determined that there is an abnormality in the axis / turret, then the type of backup machining is determined based on the combination of the usable spindle and turret, and if there is no backup machining program prepared , the abnormal processing is performed to perform the processing. finish.

When it is determined that the type is the first backup processing, the abnormal disconnection processing program F performs the above-described abnormal disconnection processing, and then the first backup processing program D causes the first backup processing shown in FIG. The backup machining is executed to machine one workpiece, and if the repeat is set, this program first backup machining is repeated. If repetition is not set, the process ends.

When it is determined that the type is the second backup processing, the abnormal disconnection processing program F performs the above-described abnormal disconnection processing, and then the second backup processing program E performs the second backup processing shown in FIG. The backup machining is executed to machine one workpiece, and if the repeat is set, this program second backup machining is repeated. If repetition is not set, the process ends.

Next, another embodiment of the present invention will be described with reference to FIGS. In this embodiment, as shown in FIG. 7, the normal machining program is divided into programs (-) (programs for executing the respective steps (1) to (1) in FIG. 1) without preparing a backup machining program dedicated to backup machining. Insert a branch / jump program between and between, and execute all programs during normal machining, but BU during backup machining
By jumping a program that cannot be executed depending on the number, the first backup processing shown in FIG.
Alternatively, the second backup process shown in FIG. 1C is performed.

FIG. 8 is a flowchart of the processing process according to this embodiment. When the machining is started, it is first determined whether or not there is an abnormality. If there is no abnormality, the backup number BU is set to "0" for normal machining, and the machining program is executed on the first spindle side. Next, in the determination of BU, “BU =
Since it is "0", the machining program is executed on the first spindle side and the machining program is executed on the second spindle side.

In the subsequent BU determination as well, since "BU = 0", the machining program is executed on the second spindle side. As a result, the normal machining shown in FIG.
Process individual workpieces. Then, if the repeat is not set, the process is ended, but if the repeat is set, the BU is discriminated again, and since “BU = 0”, the process returns to the execution of the machining program, and the processes thereafter are repeated. .

If it is determined that there is an abnormality in the first determination as to whether or not there is an abnormality, it is then determined whether or not there is an abnormality related to the shaft / turret, and if not, abnormality processing such as power shutdown and alarm generation is performed. After that, the process is terminated and the process waits for a return. axis·
If it is determined that there is an abnormality in the turret, then the type of backup machining is determined based on the combination of the usable spindle and turret, and if backup machining is not ready , abnormal processing is performed and the processing ends.

If the second spindle cannot be used, the first backup machining can be performed, so BU is set to "1". If the first spindle cannot be used, the second backup machining can be performed, so BU is set to "2". Then, when BU is set to "1", the machining program is executed on the first spindle side, and the next B
Since it is “BU = 1” in the determination of U, the machining program is executed, and the machining of one work by the first backup machining shown in FIG. 1B is completed. After that, since “BU = 1” is determined by the BU determination, the presence or absence of the repetition is determined. If the repetition is not set, the process is ended, and if the repetition is set, the process returns to the execution of the machining program, and thereafter. Repeat the process.

When BU is set to "2", the process proceeds to the determination of BU, and since "BU = 2", the machining program is executed on the second spindle side, and "BU = 2" is also determined in the determination of the next BU. Therefore, the machining program is executed to complete the machining of one workpiece by the second backup machining shown in FIG. Then, if the repeat is not set, the process is ended, but if the repeat is set, the process is performed again in B.
U is discriminated, and since "BU = 2", the process returns to the discrimination of the first BU, and the processes thereafter are repeated. As described above, according to this embodiment, it is possible to perform the back-up machining equivalent to that of the above-mentioned embodiments without preparing a dedicated backup machining program.

Each of the above embodiments has been described as an example in which the type of backup machining is uniquely determined by the NC device itself depending on the combination of the remaining usable spindle and tool rest when an abnormality occurs. However, it may not be possible to determine uniquely, so when an abnormality occurs, the contents of the spindle and turret recording section used for machining are read and compared with the remaining usable spindle and turret and backed up. It is also possible to judge whether or not it can be used for processing, display the result on the display 43, and allow the operator to select from the display and perform backup processing.

[0061]

As described above, the N of the present invention is
According to the processing method using the C lathe, an abnormality occurs in the NC lathe, and a plurality of spindles or a part of the tool post become unusable, or even if they are not used due to the setting, the remaining usable spindles and Since the parts can be processed by backup processing using the turret, it is possible to significantly reduce the situation where the movable ratio becomes zero compared to the conventional case. Further, it is possible to reduce the time and labor required for setup in the case of small-quantity production, and to continue machining even when there is only one round bar of material for the NC lathe with two spindles.

Further, according to the NC lathe capable of back-up machining according to the present invention, when an abnormality (including a case where the spindle or a part of the tool rest is set to be unused) occurs,
If the remaining usable spindle and tool rest can be machined, back-up machining using them is automatically performed, and backup machining can be efficiently performed.

[Brief description of drawings]

FIG. 1 is a process drawing for explaining an embodiment of a processing method using an NC lathe according to the present invention.

FIG. 2 is a functional block diagram showing only a portion related to the present invention in a control unit of an NC lathe capable of back-up machining according to the present invention.

FIG. 3 is an external perspective view showing an example of an NC lathe embodying the present invention.

FIG. 4 is a block diagram showing a configuration of a control unit of the NC lathe.

5 is a diagram showing a storage example of each program used in the embodiment shown in FIG.

FIG. 6 is a flowchart of a processing process according to the embodiment shown in FIG.

FIG. 7 is a diagram showing an example of storing a machining program in another embodiment of an NC lathe capable of backup machining according to the present invention.

FIG. 8 is a flowchart of a processing process according to the same embodiment.

[Explanation of symbols]

10: Bed 11A: 1st headstock 12A: 1st
Spindle motor for spindle 13: Turret base 14A: First guide bush 14B: Second guide bush 15A, 15B: Work pieces 16A, 16B, 25: Guide rail 17A: First
Turret 17B: Second turret 18A, 18B: Y-axis table 19A, 19B: X-axis table 20A: Y1-axis servo motor 20B: Y2-axis servo motor 21A: X1-axis servo motor 21B: X2-axis servo motor 22A, 22B, 2
4, 32: Tool 23: Rear tool post 26: Rear headstock base 2
7: Rear spindle 28: Y3 axis servo motor 29: Z3 axis servo motor 30: Rear spindle spindle motor 31: Opposed tool rest 40: System controller 41: Program input section
42a: keyboard 42b: switch 43: display 44: operation panel 45: input / output control unit 46: system control program memory (ROM) 47: automatic programming unit 48: machining program memory 48a: machining program storage unit 48b: backup program storage Part 49: Display data storage part 50: RAM 51: Machining program processing part 52: Communication control part 53: Machining operation control part 60:
Drive unit 61: Servo mechanism of each axis motor 62: Control drive unit of each axis 63: Spindle motor of each spindle 64: Spindle motor control drive unit 65: Each sensor 66: Sensor input unit

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-5-309501 (JP, A) JP-A-2-101504 (JP, A) JP-A-4-223847 (JP, A) JP-A-62-1 241645 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23B 1/00 B23B 3/06 B23Q 15/00 G05B 19/18

Claims (4)

(57) [Claims] 1. An NC having a plurality of at least one of a spindle and a tool rest, and performing machining in association with each other.
Lathe by, when the abnormality due to that some people have more of the main shaft and tool rest for use in a normal processing is not used by set or become unavailable is generated, the abnormality occurs
Power is cut off to the part that
After performing the abnormal disconnection process to ignore, the backup machining is performed by the pre-stored machining program that enables back-up machining using the remaining usable spindle and turret. A machining method using an NC lathe. 2. The machining method using the NC lathe according to claim 1, wherein the prestored machining programs are a plurality of different types of backup machining programs, and the backup machining is performed by a combination of the usable spindle and tool post. A machining method using an NC lathe characterized by determining a type and selecting a backup machining program according to the type. 3. An NC having a plurality of at least one of a spindle and a tool rest, and performing machining in association with each other.
In a lathe, a machining operation control means for controlling machining operation by the spindle and the tool post, an abnormality presence / absence determining means for determining presence / absence of abnormality, and when the means determines that there is no abnormality, the machining operation control means is provided with a normal operation. Normal machining control means that operates to perform machining using the spindle and turret used in machining, and an abnormality content determination means that determines the content of the abnormality when the abnormality determination means determines that there is an abnormality. when the determination result is, some of who have more of the main shaft and tool rest for use in the processing of the normal is abnormal due determined to be unused by the setting or becomes unavailable, its
Shut off the power supply to the part where the
Abnormal disconnection processing to ignore the detection signal from
Back-up machining control means for operating the machining operation control means so as to perform machining using the remaining usable spindle and tool rest after performing the above-mentioned processing.
C lathe. 4. The NC capable of back-up machining according to claim 3, wherein the backup machining control means has a plurality of backup machining programs selected by a combination of remaining usable spindles and tool rests.
lathe.